Messages in this thread | | | Date | Sun, 12 Jun 2016 13:49:02 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH v2 3/3] x86/quirks: Add early quirk to reset Apple AirPort card |
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* Lukas Wunner <lukas@wunner.de> wrote:
> The solution is to reset the card on boot by writing to a reset bit in > its mmio space. This must be done as an early quirk and not as a plain > vanilla PCI quirk to successfully combat memory corruption by DMAed > packets: Matthew Garrett found out in 2012 that the packets are written > to EfiBootServicesData memory (http://mjg59.dreamwidth.org/11235.html). > This type of memory is made available to the page allocator by > efi_free_boot_services(). [...]
Btw., would it also make sense to *not* free those pages by default, if firmware can occasionally corrupt them? What memory size are we talking about?
Thanks,
Ingo
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